What Will You Find For A T-Shirt?

A while back, mental_floss research editor Sandy Wood stumbled across our first ten issues for sale on eBay. $191.48 sounds pricy, but we've long since sold out many of those.

There must be other _flossy stuff for sale on eBay that wasn't published by us. Which brings me to today's t-shirt challenge. To win, you must find the most quirky, smart, funny, ironic "“ or any other adjective that roughly translates to "cool" "“ thing on eBay. Rare books, mind-blowing inventions, forgotten fads, Thundercats memorabilia, whatever.